Disabling DLQ usage for JMS queues

Hello,
I'd like to know how I can 'disable' DLQ (dead letter queue) usage for my JMS queues on JBoss 5.1. We'd like to discard messages that are unsent rather than attempt to redeliver them.

I know how to specify a queue's DLQ, however I can't quite figure out how to turn off this behaviour (It doesn't like it when I set DLQ to an empty or null value). I've experimented with changing a queue's DLQ to itself, however I'm not sure if this will throw errors.